Urea 46% of urea is mainly used in agriculture, so that about 90% of the use of this material in agriculture as fertilizer contains nitrogen. But another application that has 46% urea is in the manufacture and production of all kinds of plastic, glue, potassium cyanate. It is also used in the production of urea formaldehyde and urea melamine formaldehyde resins, which are used in the production of plywood for water.